Having used both removable batteries and external battery bricks, the external battery brick is FAR more useful.
Probably so. Luckily, there's a much better way to go. Throw out the original battery, replace it with one that has several times the capacity, replace the back with the supplied replacement, and buy the appropriate hardshell if that's how you roll.
Result? More battery life than a brick, no having to plug in all the time, and no need to remove the battery until it dies, which will likely be some years down the road.
When I bought my Note 3 (SM-N900V), it wouldn't last a day. I'd have to turn it off (not use apps, etc.) before bedtime if I wanted it to have enough juice left to receive a call, text, IM or email, etc. -- it would hit 5% by 9pm or so. Once I replaced the battery, I just pop the thing on the charger about every other day while I'm sleeping and have no worries. It'll go three full days of use, but that does put the battery down to about 20%, so I tend to avoid it.
This makes the phone thicker and heavier. I don't mind a bit. But some people would.